How much difference in ROF are we talking about? For it to be noticeable, I assume it's at least 3-4 rps. Maybe it's a good idea to actually measure it using sound wave analysis just for the sake of it.
The way I see it, the major components that will affect ROF are motor, gearing, mosfet/wiring, and battery.
I'd just try the battery thing first and go from there.
Are the guns relatively untouched inside? If so, we could rule out gearing and mosfet/wiring. Maybe the next step is to swap the motors and try. We have to consider the possibility that the video review is wrong.
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